Year	%
1989	3.91
1990	3.92
1991	3.95
1992	3.95
1993	3.75
1995	2.94
1996	2.86
1997	2.6
1998	3.09
1999	2.31
2000	2.1
2001	2.11
2002	2.16
2003	1.96
2004	1.79
2005	1.75
2006	1.7
2007	1.55
2008	1.58
2009	1.71
2010	1.66
2011	1.67
2012	1.67
2013	1.67
2014	1.69
2015	1.69
2016	1.65
2017	1.66
2018	1.59
2019	13.78
2020	1.52
2021	1.47